【作者】 郭志娟；

【导师】 马生明；

【作者基本信息】 中国地质科学院 ， 地球化学， 2012， 硕士

【摘要】 土壤热磁组分测量作为隐伏矿勘查的一种新方法,能够强化微弱的矿化信息,主要应用于常规地球化学勘查方法效果不佳的覆盖区找矿,具有较好的稳定性和异常重现性,能够发现深部矿体引起的微弱矿化信息,实现强化异常,有效指导找矿的目的。论文以蔡家营铅锌银矿试验区为研究对象,开展土壤热磁组分特征的研究,通过对士壤热磁组分形貌特征、矿物学特征、化学成分的分析以及元素富集方式的探讨,为土壤热磁组分测量方法的应用提供理论依据。研究发现：(1)土壤热磁组分以铁锰氧化物为主,是由土壤中的非晶质铁锰氧化物转化而来的,士壤热磁组分以单颗粒或者颗粒集合体的形式存在于士壤中；(2)土壤、土壤热磁组分、非磁性组分中铁锰氧化物与主成矿及其相关伴生元素相关关系的分析证实了土壤热磁组分对矿化指示元素主要的富集作用。在准苏吉花试验区根据特征统计参数、地球化学异常特征及地球化学剖面测量对比常规土壤测量和土壤热磁组分测量的应用效果,可以发现,无论从异常强度还是异常规模的角度来讲,土壤热磁组分测量都明显高于常规土壤测量,能够获得比常规土壤测量更明显的地球化学异常,显示出该方法在运积物覆盖区地球化学勘查中较好的应用前景。应用因子分析和聚类分析研究土壤热磁组分测量数据结构的特点,反映成矿特征的元素间的共生组合关系,并利用因子得分计量图来表征元素的综合异常信息。研究结果表明,将统计分析应用到土壤热磁组分测量数据处理中进行地球化学异常的解释和评价,可以更好的从整体上认识地球化学元素异常特征,以及土壤热磁组分中各元素间所蕴含的地球化学信息的关联性,同时使得异常的圈定更为简便和有效,为深层次强化异常信息提供了可行的技术手段。更多还原

【Abstract】 As a new method in buried deposit ore prospecting, soil thermomagnetic component measurement can strengthen the weak mineralization information, mainly applied in coverage regions where conventional geochemical exploration methods are not effective. With the good stability and abnormal reprocucibility, this method can intensify weak mineralization information caused by deep ore body and achieve the purpose of strengthening the anomalies making sense to the ore-body instruction.This paper takes the Caijinying lead-zinc-silver test area as the research object, and carry out the research on the morphology features of soil thermomagnetic component. The discussion of the mineralogical features、 chemical analysis and the enrichment of indicator elements, as well as the demonstration application provide the theoretic bases of the soil thermomagnetic measurement. The research demonstrates:(1) Crystalline Fe-Mn oxides that is transformed by the noncrystalline Fe-Mn oxides is the predominant ingredient in soil thermomagnetic components, which exist in forms of single grain or particle aggregates.(2) The correlative analysis between Fe-Mn oxides and mineralized indicator elements of soil、 soil thermomagnetic components and nonmagnetic components confirms the enrichment of soil thermomagnetic components on the mineralization indicator elements.Based on the contrast analysis of the characteristic statistical parameters and geochemical anomalies applied in Zhunsujihua test district, the results illustrates that whether from the point of the anomaly intensity or the anomaly size, the effects in soil thermomagnetic survey are more remarkable than that in standard soil survey, and more importantly, soil thermomagnetic survey is more powerful in detecting the weak mineral information, showing the application prospect in coverage areas.The factor and cluster analyses are applied to research the characateristics of the data and element combination in Zhunsujihua test area, and the factor score maps are drawn to indicate the information of the geochemical comprehensive anomaly. The results confirms that the statistical analysis used in the interpretation and evaluation of geochemical anomaly in soil thermomagnetic measurement can better recognize the characteristics of the geochemical elements on the whole, and the relationship of the geochemical information can be figured out in geochemical thermomagnetic components, which provide more reliable foundation for strengthening the anomaly with profound senses.更多还原